双排支座设置对多塔斜拉桥的影响

Influence on internal force of multi-pylon cable-stayed bridge by setting double row bearings

为解决目前多塔斜拉桥最为突出的刚度问题,以既有提高结构刚度的措施为基础,借助依托项目,采用空间桥梁有限元专用程序,考虑大跨度斜拉桥中的几何非线性效应,分析研究了设置不同支座间距的双排支座对六塔斜拉桥刚度和传力系统及内力分布等方面的影响.结果表明:双排支座的设置可以提高斜拉桥刚度10%以上,对主梁的内力分布存在最优支座间距区间,对索塔和拉索亦均有相应影响.

Stiffness problem is one of the prominent problems of multi-pylon cable-stayed bridge.Based on the existing method of improving the stiffness and the geometry nonlinear effect of the long span cable-stayed bridges,the finite element model has been built in this paper.The stiffness,the way of force transmission and the distribution of internal force of six tower cable-stayed bridge are analysed by setting double row bearings with different distance.As a result,stiffness can be improved 10%.There is a best region for space between double row bearings.Besides,there’s the influence on internal force of towers and cables.